Note that haplogroup J2-(DYS413<=18) should be fairly close to J-M410, and J2-(xDYS413<=18) should be fairly close to J-M12, since there seem to be few J-M410's with the "long" DYS413 alleles. The correlation analysis:
The only correlation that reaches significance (and at the 1%) level is between the aforementioned J2 groups; this may point to a differential representation of J2a and J2b in Greek sub-populations.
A dendrogram of the 19 populations:
The principal components plot:
As it appears, J2-(DYS413<=18) is positively correlated with PC1, while J2-(xDYS413<=18) is negatively correlated with it. On the other hand PC2 contrasts haplogroup DE on the one hand with mainly R1 on the other; indeed, the correlation between DE and the combined frequency of R1a and P*(xR1a) -which mostly corresponds to R1b and indeed R-M269 in Greece- is almost significant at the 5% level. Ratio of J2*(xDYS413<=18)/J2 in Greece: A north-west "Epirotic" concentration of high ratios is, I think, evident, contrasted with a south-western "Aegean" concentration of low ratios.